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srsLTE
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Starting to send Initial Context Setup Request to eNB.

This commit is contained in:
Pedro Alvarez 2017-11-29 12:01:53 +00:00
parent 5598e10ed6
commit 425f5d22b5
2 changed files with 26 additions and 15 deletions
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2
srsepc/hdr/mme/s1ap_common.h
View File

@ -56,6 +56,8 @@ typedef struct{
uint64_t imsi;
uint32_t enb_ue_s1ap_id;
uint32_t mme_ue_s1ap_id;
uint16_t enb_id;
struct sctp_sndrcvinfo enb_sri;
struct eps_security_ctxt{
uint8_t k_asme[32];
uint8_t xres[8];

39
srsepc/src/mme/s1ap.cc
View File

@ -365,6 +365,9 @@ s1ap::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSAGE_STRUCT *ini
uint8_t proc_transaction_id = pdn_con_req.proc_transaction_id; //TODO: Transaction ID unused
m_s1ap_log->console("EPS Bearer id: %d\n", eps_bearer_id);
//Add eNB info to UE ctxt
memcpy(&ue_ctx.enb_sri, &enb_sri, sizeof(struct sctp_sndrcvinfo));
//Get Authentication Vectors from HSS
if(!m_hss->gen_auth_info_answer_milenage(imsi, ue_ctx.security_ctxt.k_asme, autn, rand, ue_ctx.security_ctxt.xres))
{
@ -548,9 +551,19 @@ bool
s1ap::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id, struct srslte::gtpc_create_session_response *cs_resp)
{
ue_ctx_t *ue_ctx;
LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPREQUEST_STRUCT in_ctxt_req;
LIBLTE_S1AP_E_RABTOBESETUPITEMCTXTSUREQ_STRUCT *erab_ctxt = &in_ctxt_req.E_RABToBeSetupListCtxtSUReq.buffer[0]; //FIXME support more than one erab
//Prepare reply PDU
LIBLTE_S1AP_S1AP_PDU_STRUCT pdu;
pdu.choice_type = LIBLTE_S1AP_S1AP_PDU_CHOICE_INITIATINGMESSAGE;
LIBLTE_S1AP_INITIATINGMESSAGE_STRUCT *init = &pdu.choice.initiatingMessage;
init->procedureCode = LIBLTE_S1AP_PROC_ID_INITIALCONTEXTSETUP;
init->choice_type = LIBLTE_S1AP_INITIATINGMESSAGE_CHOICE_INITIALCONTEXTSETUPREQUEST;
LIBLTE_S1AP_MESSAGE_INITIALCONTEXTSETUPREQUEST_STRUCT *in_ctxt_req = &init->choice.InitialContextSetupRequest;
LIBLTE_S1AP_E_RABTOBESETUPITEMCTXTSUREQ_STRUCT *erab_ctxt = &in_ctxt_req->E_RABToBeSetupListCtxtSUReq.buffer[0]; //FIXME support more than one erab
srslte::byte_buffer_t *reply_buffer = m_pool->allocate();
//Find UE Context
std::map<uint32_t, ue_ctx_t*>::iterator ue_ctx_it = m_active_ues.find(mme_ue_s1ap_id);
if(ue_ctx_it == m_active_ues.end())
@ -562,12 +575,12 @@ s1ap::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id, struct srslte:
//Add MME and eNB S1AP Ids
bzero(&in_ctxt_req, sizeof(in_ctxt_req));
in_ctxt_req.MME_UE_S1AP_ID.MME_UE_S1AP_ID = ue_ctx->mme_ue_s1ap_id;
in_ctxt_req.eNB_UE_S1AP_ID.ENB_UE_S1AP_ID = ue_ctx->enb_ue_s1ap_id;
in_ctxt_req->MME_UE_S1AP_ID.MME_UE_S1AP_ID = ue_ctx->mme_ue_s1ap_id;
in_ctxt_req->eNB_UE_S1AP_ID.ENB_UE_S1AP_ID = ue_ctx->enb_ue_s1ap_id;
//Set UE-AMBR
in_ctxt_req.uEaggregateMaximumBitrate.uEaggregateMaximumBitRateDL.BitRate=4294967295;//2^32-1
in_ctxt_req.uEaggregateMaximumBitrate.uEaggregateMaximumBitRateUL.BitRate=4294967295;//FIXME Get UE-AMBR from HSS
in_ctxt_req->uEaggregateMaximumBitrate.uEaggregateMaximumBitRateDL.BitRate=4294967295;//2^32-1
in_ctxt_req->uEaggregateMaximumBitrate.uEaggregateMaximumBitRateUL.BitRate=4294967295;//FIXME Get UE-AMBR from HSS
//eRAB context to setup
erab_ctxt->e_RAB_ID.E_RAB_ID = cs_resp->eps_bearer_context_created.ebi;
@ -585,20 +598,16 @@ s1ap::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id, struct srslte:
memcpy(erab_ctxt->gTP_TEID.buffer, &tmp_teid, sizeof(uint32_t));
//Set UE security capabilities and k_enb
in_ctxt_req.UESecurityCapabilities.encryptionAlgorithms.buffer[0] = 0; //EEA0
in_ctxt_req.UESecurityCapabilities.integrityProtectionAlgorithms.buffer[0] = 1; //EIA1
in_ctxt_req->UESecurityCapabilities.encryptionAlgorithms.buffer[0] = 0; //EEA0
in_ctxt_req->UESecurityCapabilities.integrityProtectionAlgorithms.buffer[0] = 1; //EIA1
uint8_t key_enb[32];
liblte_security_generate_k_enb(ue_ctx->security_ctxt.k_asme, ue_ctx->security_ctxt.dl_nas_count, key_enb);
liblte_unpack(key_enb, 32, in_ctxt_req.SecurityKey.buffer);
liblte_unpack(key_enb, 32, in_ctxt_req->SecurityKey.buffer);
//Set Attach accepted and activate defaulte bearer NAS messages
//TODO
//Pack everything and send it to the eNB
LIBLTE_S1AP_S1AP_PDU pdu;
LIBLTE_ERROR_ENUM err = liblte_s1ap_pack_s1ap_pdu(&pdu, (LIBLTE_BYTE_MSG_STRUCT*)reply_buffer);
if(err != LIBLTE_SUCCESS)
@ -607,13 +616,13 @@ s1ap::send_initial_context_setup_request(uint32_t mme_ue_s1ap_id, struct srslte:
return false;
}
//Send Reply to eNB
ssize_t n_sent = sctp_send(m_s1mme,reply_msg->msg, reply_msg->N_bytes, enb_sri, 0);
ssize_t n_sent = sctp_send(m_s1mme,reply_buffer->msg, reply_buffer->N_bytes, &ue_ctx->enb_sri, 0);
if(n_sent == -1)
{
m_s1ap_log->error("Failed to send Initial Context Setup Request\n");
return false;
}
m_pool->deallocate(reply_buffer);
return true;